Only clients and servers belonging to the same operating system can communicate over the internet

Mobiles can not connect to internet

An applet is a special kind of program that is transmitted over the Internet and automatically executed by the Java-compatible web browser.

Correct Answer : D

A: All the programs which are available on internet are not safe. There might be malicious software or virus. These kind of programs harm computer. B: Client and server need not run on same operating system. They can run on 2 different systems and can be connected through internet. From client side through browser, request reaches the server in HTML or any other compatible format. And server sends response to the client. C: Mobiles can connect to internet. They can either use WIFI or cellular data. D: An applet is a special kind of Java program that travels through internet from server side to client side and gets executed in client's system by Java compatible web browser.